SouthMark45 - before your first shot, hit one of the buttons until water comes out of the group - like, 1 second. See how it goes.
For what’s worth, I had the same “issue” with a Profitec Pro-700 and a manual single dose grinder Kinu M68.
I usually don’t do back to back shots, unless I have visitors who prefer coffee over tea.
So I don’t think it’s an Elizabeth problem as such, but more of a coffee world science nonsense - I’d rather not lose any sleep over it. 😊